57 lines
1.8 KiB
Markdown
57 lines
1.8 KiB
Markdown
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This is a rough guide on how to make nim source files behave like scripts. This document targets debian/ubuntu-likes; you may have to adjust for other systems.
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## Prequisites
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* Install tcc (optional, but recommended): `sudo apt install tcc`
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* Make sure binfmt_misc support is available: `ls /proc/sys/fs/binfmt_misc/register`
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## The script runner
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Create `/usr/local/bin/nimtcc`, like so:
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```bash
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#!/bin/bash
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if [[ "$#" -eq 0 ]]; then
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echo "at least 1 argument required" >&2
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exit 1
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fi
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if [[ ! -e "$1" ]]; then
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echo "not found: $1" >&2
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exit 1
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fi
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umask u+rwx
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out=$(mktemp ${TMPDIR:-/tmp/}$(basename $1).XXXXXXXXXXXX)
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function finish() {
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rm -- "$out"
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}
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trap finish EXIT
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nim compile \
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--verbosity:0 \
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'--hint[Processing]:off' \
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--cc:tcc \
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"-o:$out" \
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-r $@
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```
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The script creates a temp file (in /tmp) to write the compiled program to, and immediately removes it thereafter again.
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* Make sure nim is available on PATH, or change the path to the binary in the script.
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* Mark it as executable: `sudo chmod +x /usr/local/bin/nimtcc`
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* .. and test it: `$ nimtcc my_script.nim`. If it doesn't work, fix it.
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**N.B.:**
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- This still creates a `nimcache` in the current directory. I've left it in as a compromise to speed up iterative script development. If this is not desired, you will have to adjust the script to create an additional directory (with mktemp -d), pass that to the compiler; and then remove it afterwards.
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- Similarily, you can get rid of the whole mktemp to write the script binary to the current directory.
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## binfmt_misc
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Now, optionally, make it so you can mark scripts as executable and run them directly. This requires binfmt_misc support in your kernel. Most modern kernels have this enabled by default.
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* `$ echo ':nimtcc:E::nim::/usr/local/bin/nimtcc:' | sudo tee -a /proc/sys/fs/binfmt_misc/register`
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* `$ chmod +x my_script.nim`
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* `$ ./my_script.nim`
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